WO2005071510A1 - Systeme et procede de diminution de la consommation d'energie par un chauffe-eau, et thermostat associe - Google Patents

Systeme et procede de diminution de la consommation d'energie par un chauffe-eau, et thermostat associe Download PDF

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Publication number
WO2005071510A1
WO2005071510A1 PCT/US2005/000578 US2005000578W WO2005071510A1 WO 2005071510 A1 WO2005071510 A1 WO 2005071510A1 US 2005000578 W US2005000578 W US 2005000578W WO 2005071510 A1 WO2005071510 A1 WO 2005071510A1
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WO
WIPO (PCT)
Prior art keywords
water heater
hot water
thermostat
mode
electronic controller
Prior art date
Application number
PCT/US2005/000578
Other languages
English (en)
Inventor
John Gilman Chapman, Jr.
Nicholas Ashworth
Robert Burt
Timothy E. Wallaert
Original Assignee
Maple Chase Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maple Chase Company filed Critical Maple Chase Company
Publication of WO2005071510A1 publication Critical patent/WO2005071510A1/fr

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
    • G05D23/1904—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value variable in time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/104—Inspection; Diagnosis; Trial operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/156—Reducing the quantity of energy consumed; Increasing efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/172—Scheduling based on user demand, e.g. determining starting point of heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/10—Control of fluid heaters characterised by the purpose of the control
    • F24H15/174—Supplying heated water with desired temperature or desired range of temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/269—Time, e.g. hour or date
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/20—Control of fluid heaters characterised by control inputs
    • F24H15/281—Input from user
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
    • F24H15/395—Information to users, e.g. alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H15/00—Control of fluid heaters
    • F24H15/40—Control of fluid heaters characterised by the type of controllers
    • F24H15/414—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based
    • F24H15/45—Control of fluid heaters characterised by the type of controllers using electronic processing, e.g. computer-based remotely accessible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters

Definitions

  • the present invention relates generally to appliance control systems, and more particularly to remote control of a water heater appliance.
  • a water heater in simplified terms, includes a large water storage tank and a heating element that is used to heat the water in the tank to a preset temperature. This preset temperature may be adjusted by a user via an onboard thermostat. Once a desired temperature is set, most consumers do not give their water heater another thought, as long as hot water is always available when desired.
  • the water heater works to maintain the water in its storage tank at the preset temperature, these water heaters are designed with efficient insulation to minimize heat loss to the ambient to minimize energy consumption.
  • Many water heaters also include an energy savings mode that may be set by the consumer. This energy saving mode allows the temperature of the water in the storage tank to drop to a level, e.g. 68° Fahrenheit, so as to reduce the energy usage of the water heater. In this way, the water in the storage tank will not freeze and the energy usage of the water heater will be reduced. This mode is meant to be used during extended periods of non-use, such as for summer homes or when a family is on vacation.
  • the present invention provides a new and improved system and method for conserving energy usage. More particularly, the present invention provides a new and improved method for conserving energy usage by a hot water heater by coordinating power saving operation with the HVAC system, and/or by allowing a user to separately set power saving modes for the hot water heater. For coordinated operation, setting of the HVAC system into a vacation mode also automatically sets the hot water heater into a vacation mode. For autonomous operation, the user may set different temperature modes of operation for the hot water heater for different times of day. These different modes may include different temperature set points, different tolerance bands, temperature differentials, etc.
  • FIG. 1 is a simplified home environment diagram illustrating an environment into which the system of the present invention finds particular applicability
  • FIG. 2 is a front view illustration of an embodiment of an intelligent thermostat constructed in accordance with the teachings of the present invention.
  • FIGs. 3-4 are exemplary user interface displays generated by an embodiment of the system of the present invention.
  • FIG. 1 illustrates a simplified home environment 100 into which the system of the present invention finds particular applicability.
  • This typical home environment 100 includes an intelligent thermostat 200.
  • the thermostat 200 controls heating of the home environment 100 by the furnace 102, and possibly cooling of the home environment 100 by the air conditioning system 104.
  • the interface to both the furnace 102 and the air conditioning system 104 is typically pre-wired in the home environment 100, although the communications control from the thermostat 20O to the furnace 102 and to the air conditioning system 104 may also be wireless as desired by providing receiver/transmitter circuitry in the furnace 102 and air conditioning system 104. Similar receiver/transmitter circuitry is also required in thermostat 200 to provide this communications capability.
  • the typical home environment 100 also includes a hot water heater 106 to provide hot water for usage in the home environment 100, for example for use in shower 108.
  • the typical hot water heater includes an onboard thermostat 110 that may be set by the user to a desired water temperature for the water stored within water heater 106.
  • this onboard thermostat 110 is the only control means provided to regulate the temperature of the water in the water heater 106.
  • This onboard thermostat most often takes the form of a simple adjustable dial with temperature markings corresponding to the temperature set points for the hot water.
  • These onboard thermostats 110 also typically include warning designations or positional lockouts to prevent the inadvertent setting of the thermostat 110 to a setting that would result in scalding water being produced by the water heater 110.
  • the onboard thermostats 110 also generally include a low temperature or vacation setting.
  • This vacation setting allows the user to reduce the energy consumption by the hot water heater 106 by reducing the temperature at which the water in the tank is maintained.
  • a setting results in the thermostat regulating the temperature of the water in the water heather 106 to approximately 65°F. This temperature is sufficient to prevent the water in the water heater 106 from freezing, which could result in damage to the hot water heater 106. Additionally, this temperature allows the water heater 106 to heat the water to a usable temperature within a relatively short period of time after the onboard thermostat 110 is returned to its normal setting.
  • the water heater 106 utilizes an electronic controller 112 to regulate the water temperature of the water heater 106.
  • the electronic controller 112 also includes communications capability that allows the water heater 106 to communicate with an intelligent thermostat 200.
  • This intelligent thermostat 200 in addition to controlling the typical heating, ventilating, and air conditioning (HVAC) system components such as the furnace 102 and air conditioning unit 104, also includes programming that allows both coordinated control with the HVAC system settings as well as separate programmability of the water heater settings.
  • HVAC heating, ventilating, and air conditioning
  • the system of the present invention additionally contemplates the usage of wireless communication between the intelligent thermostat 200 and the electronic controller 112 of the hot water heater 106. Additionally or alternatively, the system of the present invention may also include a system BUS to which each of the individual controllable appliances and the intelligent thermostat would connect. As is well-known in the art, information communicated on such a system BUS includes address information identifying and/or destination of the information transmitted thereon. Such individual addressing is not typically required in the wired network whereby each individual appliance is separately wired to the thermostat 200. Various other wired infrastructures could be utilized with the system of the present invention, and are considered within the scope thereof.
  • a preferred embodiment of the present invention utilizes wireless communication between the appliances and thermostat to communicate system diagnostic information and self-test control signals therebetween.
  • a preferred embodiment to the thermostat 200 of the present invention includes the capability to communicate both wirelessly and through a wired connection.
  • various wireless communication protocols and standards may be implemented depending upon the particular home environment 100 in which the system is to be installed. That is, while the Bluetooth wireless standard may be utilized in a very small environment, its range limitations may make it unsuitable for larger or typical home environments 100.
  • wireless protocols that can be utilized to provide the wireless connectivity between the thermostat 200 and the appliances for which service diagnostic information and self-test control may be provided.
  • These other wireless protocols include, but are not limited to, the 802.11 or 802.15 family of standards. While proprietary wireless protocols may also be utilized, the use of a standard wireless protocol ensures interoperability with appliances by different manufacturers.
  • FIG. 2 An embodiment of a thermostat constructed in accordance with the teachings of the present invention to incorporate the features of the invention is illustrated in FIG. 2.
  • this embodiment of the thermostat 200 includes a user display 202 on which is typically displayed programmatic, system, and ambient information regarding the operation of the HVAC system with which it is typically associated.
  • This user display 202 may take various forms as are well-known in the art, and in a preferred embodiment is a dot matrix LCD display.
  • the consumer or service person may activate various programmatic and control functions via a pair of soft keys 204, 206.
  • the functionality executed by these soft keys 204, 206 varies dependent upon the programmatic state in which the thermostat 200 is at the time one of the soft keys 204, 206 is depressed.
  • the particular functionality that will be instituted upon selection of one of the soft keys 204, 206 is displayed in an area of the user display 202 proximate the key 204, 206 which will institute that function.
  • the function that will be instituted upon selection of soft key 204 will be located generally in the lower left hand portion of user display 202 while the functionality that will be instituted by selection of soft key 206 will be located generally in the lower right hand portion of user display 202.
  • These functional indicators may change depending on the program state and mode in which the thermostat is currently operating.
  • this embodiment of the thermostat 200 of the present invention also includes adjustment keys 208, 210.
  • These adjustment keys 208, 210 may serve to adjust a currently selected parameter up or down, such as in the case of setting the control temperature at which the thermostat will maintain the ambient environment. Additionally, these keys 208, 210 may scroll through the available data for a selected parameter, such as scrolling through alphanumeric data that may be selected for a given parameter. Such functionality will be discussed more fully below with regard to the selection of devices for which diagnostic information is desired or on which system tests are to be run. These keys 208, 210 may also function as soft keys depending on the programmatic state in which the thermostat is operating.
  • the thermostat 200 also includes operating mode visual indicators 212, 214, 216. These indicators 212-216 provide a visual indication of the current operating mode of the thermostat. In the embodiment illustrated in FIG. 2, indicator 212 will illuminate while the thermostat 200 is operating in the cooling mode. Indicator 216 will illuminate while the thermostat 200 is operating in the heating mode. Finally, indicator 214 will illuminate to indicate that the fan is operating. Depending on the particular application, this indicator 214 may illuminate whenever the fan is running, or may illuminate only when the fan is selected to run continuously. [0023] In embodiments of the present invention that do not utilize automated switching control between the heating and cooling modes of operation, these indicators 212-216 may operate as user selectable switches to allow the consumer to select the operating mode of the thermostat 200.
  • the consumer may select the cooling mode by depressing indicator 212. In this mode, the furnace will not be turned on even if the interior ambient temperature drops below the set point.
  • the consumer in this alternate embodiment, would need to select indicator 216 to allow the thermostat 200 to operate the furnace. Consumer selection in this embodiment of indicator 214 would operate the fan continuously, as opposed to its normal automatic operation based upon a call for cooling or heat by the thermostat 200.
  • the indicators 212-216 may also be utilized to provide a visual indication of system trouble or trouble with one of the appliances with which the thermostat 200 is in communication.
  • the intelligent thermostat 200 displays a water heater set mode screen 300 on the user interface display 202.
  • This water heater set mode screen 300 includes a listing of the programmatic options available in area 302.
  • the first is a program setting that allows the user to program various modes of operation to ensure maximum comfort when hot water is desired and maximum energy savings at times when it is typically not in demand.
  • the second programmatic option available in the listing of the embodiment shown in FIG. 3 is the vacation mode setting.
  • While the preferred embodiment of the present invention automatically sets the water heater into the vacation mode when the HVAC system is set into this vacation mode, this embodiment also or alternatively allows the user to separately set the water heater into the vacation mode, regardless of the mode setting of the HVAC system.
  • this vacation mode as discussed above, the water heater is allowed to reduce its energy consumption by regulating the water temperature to a low temperature, for example 65°F.
  • the user scrolls through the listing of available programmatic options by utilizing the keys 208, 210 in the embodiment shown in FIG. 2. Selection of this vacation setting will override any other programming set for the water heater 106 until the user cancels the selection.
  • the intelligent thermostat 200 would display the screen from which the hot water heater set mode screen 300 was accessed. In one embodiment of the present invention this screen is the main menu of the thermostat 200. Selection of either of the programmatic options in area 302 is accomplished by depressing soft key 206, which corresponds to the select function 304 on the hot water heater set mode screen 300.
  • the thermostat 200 of the present invention will display the water heater set mode screen 400.
  • the water heater set mode screen 400 provides three programmatic modes of operation in area 402.
  • the modes include a WAKE mode, a SLEEP mode, and a DEMAND mode.
  • the user may set the desired temperature set point, the temperature differential, or a combination of the two. This remote setting of the temperature set parameters is unique to the present invention.
  • the setting of the individual temperature set point for each of the three modes allows the user to set the desired temperature and the times of day during which each of these modes will occur.
  • the water heater will then operate to regulate the water temperature to each of the set points during the respective modes.
  • the actual temperature set point may remain the same, but the temperature differential may be changed.
  • the WAKE mode results in a normal temperature differential for the water heater of, for example, 15°F. That is, while the water heater is operating in the WAKE mode, the temperature of the tank is allowed to fall no lower than 15° below the set temperature. This temperature variation is sufficient for normal usage of hot water throughout the day.
  • the SLEEP mode of operation allows a large differential, such as 30°F.
  • the water heater allows the temperature of the tank to fall no lower than 30°F below the set temperature.
  • This mode provides the maximum operational energy savings, while still maintaining the water at a usable temperature level during the nighttime hours.
  • the DEMAND mode of operation results in a small differential, such as 5°F.
  • the water heater only allows the temperature of the water in the tank to fall no lower than 5° below the set temperature. This mode provides the most controlled water temperature, and hence the greatest energy consumption, and would typically be used only during the typical bathing times of the day.
  • the user is able to set the time for each of these modes of operation by first selecting one of these three programmatic modes via soft key 206 corresponding to the select function 404. Once one of the operational modes has been selected, the user may program the corresponding times for each of these modes in much the same manner as the current programming of the HVAC control modes is accomplished. As such, this process is not described in detail herein. Allowing such programming for the hot water heater allows a user to experience the lowest energy usage during night hours, comfortable water temperature during the bathing hours, and lowered energy usage during the daylight hours. For example, a user could choose to set the SLEEP mode from the hours of 10:00 PM to 5:30AM, the DEMAND mode from 5:30 AM to 7:30 AM, and the WAKE mode from 7:30 AM to 10:00 PM. Such programming ensures energy savings while not causing the user to experience any level of discomfort or reduction in service.
  • the system of the present invention also contemplates the utilization of a central control point located in a user accessible area to control operation of the system.
  • This central control point need not be a thermostat. That is, the central control point could be a separate controller having a user interface whose functionality is limited to coordination of and communication with the hot water heater. This separate controller may be a stand alone controller, may be a PC application, etc.
  • the user interface and the control portions of such a thermostat need not be integrated into a single housing. That is, the user interface may be mounted in a commonly user accessed area for convenience, while the control electronics could be located remotely from the user interface.

Abstract

La présente invention concerne un système permettant de réguler la consommation d'énergie d'un chauffe-eau au moyen d'un thermostat intelligent. Ce thermostat intelligent fournit une commande programmatique du système de CVC, comme c'est le cas traditionnellement, et il fournit une commande coordonnées de la valeur de réglage thermique du chauffe-eau. Cette commande du chauffe-eau est réalisée au moyen d'un réseau de communication situé entre le thermostat intelligent et le chauffe-eau. Dans un mode de réalisation, les communications sont sans fil, bien que des communications du bus du réseau et câblées peuvent aussi être utilisées. Une commande améliorée et coordonnée est engendrée, de telle façon que des cycles thermiques opérationnels différents peuvent être fournis pour coordonner la commande programmatique du thermostat intelligent du système CVC. Une commande programmatique séparée du chauffe-eau est générée, ce qui permet de commander différents modes thermiques fonctionnels, par exemple, des modes de fonctionnement de marche, de veille et de demande.
PCT/US2005/000578 2004-01-08 2005-01-07 Systeme et procede de diminution de la consommation d'energie par un chauffe-eau, et thermostat associe WO2005071510A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53528904P 2004-01-08 2004-01-08
US60/535,289 2004-01-08

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WO2005071510A1 true WO2005071510A1 (fr) 2005-08-04

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